<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>函数防抖</title>
</head>
<body>
    <input type="text" id="ipt">
    <script>
        let ipt = document.getElementById("ipt");
        function debounce(func,time){
            let timeoutId = 0;
            return function(){
                if(timeoutId){
                    clearTimeout(timeoutId);
                }
                timeoutId = setTimeout(func,time);
            }
        }
        ipt.onkeydown = debounce(function(){
            console.log(ipt.value);
        },500)
    </script>
</body>
</html>